Next.js App Router & Vercel Blueprint: Deterministic /llms.txt, /pricing.md & /ai/summary.json
Updated 2026-11-14 · Telemetry across 2459 audited B2B SaaS domains

In our HTTP/HTML readiness check of 2459 B2B SaaS domains, Next.js sites using dynamic app/[...slug]/page.tsx or localized middleware.ts redirects frequently intercept /llms.txt, /pricing.md, and /ai/summary.json, returning locale redirects or 239.7 KB RSC HTML shells instead of clean UTF-8 text and JSON.

1. Bypass Locale & Auth Redirects in middleware.ts

import { NextResponse, type NextRequest } from "next/server";

const ASO_PATHS = new Set([
  "/llms.txt", "/llms-full.txt", "/pricing.md", "/answers.md",
  "/.well-known/ai.txt", "/.well-known/mcp.json",
  "/ai/summary.json", "/ai/faq.json", "/ai/service.json"
]);

export function middleware(req: NextRequest) {
  if (ASO_PATHS.has(req.nextUrl.pathname)) return NextResponse.next();
  const res = NextResponse.next();
  res.headers.set("Link", '</llms.txt>; rel="llms-txt", </.well-known/mcp.json>; rel="mcp"');
  return res;
}

2. Ship All 26 Validated Files + GitHub Actions Regression Gate

Place your deterministic plain-text and JSON specifications under public/ and enforce an automated HTTP/HTML readiness check in CI via .github/workflows/aso-score-gate.yml so future marketing deploys never strip your Schema.org @graph or agent feeds.